/// <summary>
/// Creates a standard VBO of type T where the length of the VBO is less than or equal to the length of the data.
/// </summary>
/// <typeparam name="T">The type of the data being stored in the VBO (make sure it's byte aligned).</typeparam>
/// <param name="target">The VBO BufferTarget (usually ArrayBuffer or ElementArrayBuffer).</param>
/// <param name="data">The data to store in the VBO.</param>
/// <param name="hint">The buffer usage hint (usually StaticDraw).</param>
/// <param name="length">The length of the VBO (will take the first 'length' elements from data).</param>
/// <returns>The buffer ID of the VBO on success, 0 on failure.</returns>
public static uint CreateVBO <T>(BufferTarget target, [In, Out] T[] data, BufferUsageHint hint, int length)
where T : struct
{
uint vboHandle = Gl.GenBuffer();
if (vboHandle == 0)
{
return(0);
}
int size = length * Marshal.SizeOf(typeof(T));
#if MEMORY_LOGGER
MemoryLogger.AllocateVBO(vboHandle, size);
#endif
Gl.BindBuffer(target, vboHandle);
Gl.BufferData <T>(target, size, data, hint);
Gl.BindBuffer(target, 0);
return(vboHandle);
}
/// <summary>
/// Loads a compressed DDS file into an OpenGL texture.
/// </summary>
/// <param name="ResourceFile">The path to the DDS file.</param>
private void LoadDDS(string ResourceFile)
{
using (BinaryReader stream = new BinaryReader(new FileStream(ResourceFile, FileMode.Open)))
{
string filecode = new string(stream.ReadChars(4));
if (filecode != "DDS ") // first 4 chars should be "DDS "
{
throw new Exception("File was not a DDS file format.");
}
DDS.DDSURFACEDESC2 imageData = DDS.DDSURFACEDESC2.FromBinaryReader(stream);//new DDS.DDSURFACEDESC2(stream); // read the DirectDraw surface descriptor
this.Size = new Size((int)imageData.Width, (int)imageData.Height);
if (imageData.LinearSize == 0)
{
throw new Exception("The linear scan line size was zero.");
}
bool compressed = true;
int factor = 0, buffersize = 0, blocksize = 0;
PixelInternalFormat format;
switch (imageData.PixelFormat.FourCC) // check the compression type
{
case "DXT1": // DXT1 compression ratio is 8:1
format = PixelInternalFormat.CompressedRgbaS3tcDxt1Ext;
factor = 2;
blocksize = 8;
break;
case "DXT3": // DXT3 compression ratio is 4:1
format = PixelInternalFormat.CompressedRgbaS3tcDxt3Ext;
factor = 4;
blocksize = 16;
break;
case "DXT5": // DXT5 compression ratio is 4:1
format = PixelInternalFormat.CompressedRgbaS3tcDxt5Ext;
factor = 4;
blocksize = 16;
break;
default:
compressed = false;
if (imageData.PixelFormat.ABitMask == 0xf000 && imageData.PixelFormat.RBitMask == 0x0f00 &&
imageData.PixelFormat.GBitMask == 0x00f0 && imageData.PixelFormat.BBitMask == 0x000f &&
imageData.PixelFormat.RGBBitCount == 16)
{
format = PixelInternalFormat.Rgba;
}
else if (imageData.PixelFormat.ABitMask == unchecked ((int)0xff000000) && imageData.PixelFormat.RBitMask == 0x00ff0000 &&
imageData.PixelFormat.GBitMask == 0x0000ff00 && imageData.PixelFormat.BBitMask == 0x000000ff &&
imageData.PixelFormat.RGBBitCount == 32)
{
format = PixelInternalFormat.Rgba;
}
else
{
throw new Exception(string.Format("File compression \"{0}\" is not supported.", imageData.PixelFormat.FourCC));
}
break;
}
if (imageData.LinearSize != 0)
{
buffersize = (int)((imageData.MipmapCount > 1) ? imageData.LinearSize * factor : imageData.LinearSize);
}
else
{
buffersize = (int)(stream.BaseStream.Length - stream.BaseStream.Position);
}
// read the pixel data and then pin it to memory so that the garbage collector
// doesn't shuffle the data around while OpenGL is decompressing it
byte[] pixels = stream.ReadBytes(buffersize);
GCHandle pinned = GCHandle.Alloc(pixels, GCHandleType.Pinned);
try
{
this.TextureTarget = (imageData.Height == 1 || imageData.Width == 1) ? TextureTarget.Texture1D : TextureTarget.Texture2D;
this.TextureID = Gl.GenTexture();
Gl.BindTexture(TextureTarget, TextureID);
Gl.TexParameteri(TextureTarget, TextureParameterName.TextureMinFilter, TextureParameter.Linear);
Gl.TexParameteri(TextureTarget, TextureParameterName.TextureMagFilter, TextureParameter.Linear);
int nOffset = 0, nWidth = (int)imageData.Width, nHeight = (int)imageData.Height;
for (int i = 0; i < (imageData.MipmapCount == 0 ? 1 : imageData.MipmapCount); ++i)
{
if (nWidth == 0)
{
nWidth = 1; // smallest mipmap is 1x1 pixels
}
if (nHeight == 0)
{
nHeight = 1;
}
int nSize = 0;
if (compressed)
{
nSize = ((nWidth + 3) / 4) * ((nHeight + 3) / 4) * blocksize;
Gl.CompressedTexImage2D(TextureTarget, i, format, nWidth, nHeight, 0, nSize, (IntPtr)(pinned.AddrOfPinnedObject().ToInt64() + nOffset));
}
else
{
PixelType pixelType = imageData.PixelFormat.RGBBitCount == 16 ? PixelType.UnsignedShort4444Reversed : PixelType.UnsignedInt8888Reversed;
nSize = nWidth * nHeight * imageData.PixelFormat.RGBBitCount / 8;
Gl.TexImage2D(TextureTarget, i, format, nWidth, nHeight, 0, PixelFormat.Bgra, pixelType, (IntPtr)(pinned.AddrOfPinnedObject().ToInt64() + nOffset));
}
nOffset += nSize;
nWidth /= 2;
nHeight /= 2;
}
#if MEMORY_LOGGER
MemoryLogger.AllocateTexture(TextureID, Size);
#endif
}
catch (Exception)
{ // There was some sort of Dll related error, or the target GPU does not support glCompressedTexImage2DARB
throw;
}
finally
{
pinned.Free();
}
}
}